[wp-trac] [WordPress Trac] #52509: Error generating Thumbnails of PDF-Files

[WordPress Trac]

#52509: Error generating Thumbnails of PDF-Files
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 Reporter:  falk07        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Media         |    Version:  5.6.1
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 This is a follow-up to #48853.

 This issue seems to be still present in Version 5.6.1
 Some PDF-Files cause an internal server error, some do not. (The server's
 error log tells something about missing headers)

 Here's what i did to isolate the error:
 - I examined the PDF-Files. The affected files had a PDF-Version 1.7 an
 were created with non-Adobe-Tools (e.g. Office365). PDFs with Version 1.4
 and 1.5 (created with Acrobat) worked well.
 - tried it with a local copy of the site on XAMPP: No Problems
 - used a little code-snippet to prevent thumbnail-generation in general:
 Upload works

 This is the snippet:
 {{{#!php
 <?php
 function disable_pdf_previews() {
     $fallbacksizes = array();
     return $fallbacksizes;
 }
 add_filter('fallback_intermediate_image_sizes', 'disable_pdf_previews');
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/52509>
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